RCA Plug to 3.5mm Mono Jack Adapter. This RCA Plug to 3.5mm Mono Jack Adapter converts 3.5mm Mono Plug to RCA Plug. With its full molded construction, this splitter will split the audio signal without a loss of quality. Black molded plastic construction. Nickel-plated contacts. Connector 1: RCA Plug. Connector 2: 3.5mm Mono Jack. Use with PC, stereo, MP3 players. External Length / Height: 36mm.